Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A communication system, comprising: a first cell and a second cell adjacent to each other, each of which permitted to install a relay station to relay between a base station and a mobile station, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the first cell and second cell, and a relay station frequency assignment decision circuit that estimates position information of one of the first cell and the second cell based on the position information stored in the position information holding memory and decides restricted bands used by the relay station from among boundary frequencies of the first cell, and a frequency to the mobile station in the second cell is assigned by avoiding the restricted bands or lowering a degree of priority on the second cell side.
A communication system mitigates interference between adjacent cellular networks (first and second cells) when using relay stations. The base station tracks the positions of relay stations and the cells. Based on this location data, the base station restricts frequency bands used by the relay station within the first cell's boundary frequencies. The system then assigns frequencies to mobile stations within the second cell, avoiding these restricted bands to reduce interference or lowering the priority of the restricted band when assigning frequencies to the mobile station.
2. A communication system, comprising: a first cell and a second cell adjacent to each other, each of which composed of a center region inside the cell using a central frequency and a boundary region at cell ends using boundary frequencies by a multi-cell frequency repetition and permitted to install a relay station to relay between a base station and a mobile station, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the first cell and second cell, and a relay station frequency assignment decision circuit that estimates position information of one of the first cell and the second cell based on the position information stored in the position information holding memory and decides restricted bands used by the relay station from among boundary frequencies of the first cell, and the central frequency of the second cell is assigned to the mobile station by avoiding the restricted bands or lowering a degree of priority on the second cell side.
A communication system addresses interference in multi-cell frequency reuse scenarios with relay stations. Cells (first and second) have center regions using a central frequency and boundary regions using boundary frequencies. The base station tracks relay station and cell positions. It estimates the position of one of the cells and defines restricted bands (from the first cell's boundary frequencies) for relay station use. When assigning frequencies to mobile stations in the second cell, the system avoids the restricted bands to minimize interference with the second cell's central frequency or lowers the priority of the restricted band when assigning frequencies to the mobile station.
3. The communication system according to claim 2 , wherein frequency hopping is allowed for frequency assignment to the relay station over time on the first cell side.
The communication system described in claim 2, which avoids interference with relay stations operating between a base station and a mobile station, further allows frequency hopping. Specifically, the frequency assignment to the relay station in the first cell can change dynamically over time. This frequency hopping can use the boundary frequencies assigned to the relay station to provide greater flexibility and reduce interference.
4. A communication apparatus operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell; a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a restricted band of boundary frequencies to be assigned to the relay station; a notification circuit that notifies the base station of the adjacent cell of the restricted band decided by the relay station frequency assignment decision circuit; and a scheduler that schedules radio resources in the local cell conforming to the restricted band decided by the relay station frequency assignment decision circuit.
A base station manages radio resources in a cell divided into a center region and a boundary region. It uses a memory to store the positions of relay stations, its own cell, and adjacent cells. A circuit estimates which adjacent cell is closest to a relay station and determines a restricted band of boundary frequencies for that relay station. A notification circuit informs the adjacent cell's base station of this restricted band. A scheduler then allocates radio resources within the local cell, adhering to the relay station's restricted band assignment.
5. The communication apparatus according to claim 4 , wherein the relay station frequency assignment decision circuit allows frequency hopping for frequency assignment to the relay station over time.
The base station described in claim 4, which manages radio resources while considering relay stations, uses frequency hopping. The frequency assignment to the relay station is allowed to change dynamically over time. This provides greater flexibility in resource allocation and avoids prolonged interference.
6. The communication apparatus according to claim 4 , wherein when the restricted band is notified from the adjacent cell, the scheduler assigns a central frequency of the local cell by avoiding the restricted band of the adjacent cell or lowering an order of priority thereof.
In the base station described in claim 4, when the base station receives a notification about a restricted band from an adjacent cell, its scheduler assigns its local cell's central frequency to mobile stations while avoiding that restricted band or lowering the priority of that restricted band in frequency assignments. This avoids conflict with the adjacent cell.
7. A communication method for operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising the steps of: acquiring position information of the relay station and position information of the local cell; estimating the adjacent cell close to the relay station based on the acquired position information; deciding a restricted band of boundary frequencies to be assigned to the relay station; notifying the base station of the adjacent cell of the restricted band decided in the relay station frequency assignment decision step; scheduling radio resources in the local cell conforming to the restricted band decided in the relay station frequency assignment decision step; and when the restricted band is notified from the adjacent cell, assigning a central frequency of the local cell by avoiding the restricted band of the adjacent cell or lowering an order of priority thereof.
A method for a base station to manage radio resources in a cell with a center and boundary region, relay stations, and mobile stations: 1) Acquire the positions of relay stations and the local cell. 2) Estimate the adjacent cell closest to a relay station. 3) Determine a restricted band of boundary frequencies for the relay station. 4) Notify the adjacent cell's base station of this restricted band. 5) Schedule radio resources in the local cell conforming to the restricted band. 6) When notified of a restricted band from an adjacent cell, assign the local cell's central frequency, avoiding the adjacent cell's restricted band or lowering its priority.
8. A non-transitory computer readable medium that stores a program causing a computer to execute a processing operation as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, the computer caused to: store position information of the relay station and position information of the local cell and an adjacent cell; estimate the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decide a restricted band of boundary frequencies to be assigned to the relay station; notify the base station of the adjacent cell of the decided restricted band decided; and schedule radio resources in the local cell conforming to the decided restricted band and, when the restricted band is notified from the adjacent cell, assigns a central frequency of the local cell by avoiding the restricted band of the adjacent cell or lowering an order of priority thereof.
A computer program stored on a non-transitory medium enables a computer to act as a base station that manages radio resources in a cell (with center and boundary regions), mobile stations, and relay stations. The program causes the computer to: 1) Store relay station, local cell, and adjacent cell positions. 2) Estimate the closest adjacent cell to a relay station and decide on a restricted band of boundary frequencies for the relay station. 3) Notify the adjacent cell of this restricted band. 4) Schedule local cell radio resources conforming to the restricted band. 5) When notified of a restricted band from an adjacent cell, assign the central frequency while avoiding the adjacent cell's restricted band or lowering its priority.
9. A communication apparatus operating as a relay station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and the relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the mobile station; a buffer that temporarily holds data to be relayed between the base station and the mobile station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit including a relay operation between the base station and the mobile station based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a restricted band used by the relay station, and the communication circuit transmits a radio signal by using the restricted band of boundary frequencies assigned to the relay station such that use as a central frequency in the adjacent cell is restricted.
A relay station includes a communication circuit, buffer, scheduling information memory, and control circuit. The base station involved includes position information for the relay station and nearby cells. The base station determines a restricted frequency band for the relay station based on the relay station's location. The relay station's communication circuit then transmits radio signals using this restricted band of boundary frequencies, ensuring its transmissions are restricted from being used as a central frequency in the adjacent cell, preventing interference.
10. A communication apparatus operating as a mobile station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, the mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the relay station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a restricted band used by the relay station, and the communication circuit receives a radio signal using the restricted band of boundary frequencies assigned to the relay station such that use as a central frequency in the adjacent cell is restricted.
A mobile station includes a communication circuit, scheduling information memory, and control circuit. The base station involved includes position information for the relay station and nearby cells. The base station determines a restricted frequency band for the relay station based on the relay station's location. The mobile station's communication circuit receives radio signals using the restricted frequency band of boundary frequencies assigned to the relay station, where those assigned frequency bands cannot be used as the central frequency in an adjacent cell, thus preventing interference.
11. A communication system, comprising: a first cell and a second cell adjacent to each other, each of which composed of a center region inside the cell using a central frequency and a boundary region at cell ends using boundary frequencies by a multi-cell frequency repetition and permitted to install a relay station to relay between a base station and a mobile station, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the first cell and second cell, and a relay station frequency assignment decision circuit that estimates position information of one of the first cell and the second cell based on the position information stored in the position information holding memory and decides non-interference bands of the central frequency of the second cell that should not be interfered, and an assignment of the non-interference bands of the boundary frequencies of the first cell to the relay station is prohibited on the first cell side.
A communication system addresses interference by avoiding interference bands in adjacent cells. Cells (first and second) have center regions (central frequency) and boundary regions (boundary frequencies). The base station tracks relay station and cell positions. It calculates "non-interference bands" related to the second cell's central frequency. It then prevents the first cell from assigning these calculated non-interference bands within its own boundary frequencies to the relay station.
12. A communication apparatus operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell; a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a non-interference band of a central frequency that should not be interfered with; a notification circuit that notifies the base station of the adjacent cell of the non-interference band decided by the relay station frequency assignment decision circuit; and a scheduler that schedules radio resources in the local cell, when the non-interference band is notified from the adjacent cell, by avoiding the non-interference band of boundary frequencies of the adjacent cell.
A base station manages radio resources, relay stations, and mobile stations in a cell (center/boundary regions). It stores relay station, local cell, and adjacent cell positions. It calculates a "non-interference band" for a central frequency that should be protected from interference. A notification circuit sends this non-interference band to the adjacent cell's base station. The scheduler, when notified of a non-interference band from an adjacent cell, avoids using the adjacent cell's boundary frequencies within that non-interference band when scheduling radio resources in the local cell.
13. A communication method for operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising the steps of: acquiring position information of the relay station and position information of the local cell; estimating the adjacent cell close to the relay station based on the acquired position information stored; deciding a non-interference band of a central frequency that should not be interfered with; notifying the base station of the adjacent cell of the non-interference band decided in the relay station frequency assignment decision step; and scheduling radio resources in the local cell, when the non-interference band is notified from the adjacent cell, by avoiding the non-interference band of boundary frequencies of the adjacent cell.
This invention relates to wireless communication systems where a base station manages radio resources in a local cell divided into an internal center region and a boundary region at the cell edges. The system includes a mobile station and a relay station that facilitates communication between the base station and the mobile station. The method involves acquiring position information of the relay station and the local cell, then estimating adjacent cells close to the relay station based on the stored position data. A non-interference band of central frequencies is determined to prevent interference. The base station of the adjacent cell is notified of this non-interference band. When the local cell receives a non-interference band notification from an adjacent cell, it schedules radio resources in the local cell while avoiding the boundary frequencies of the adjacent cell to minimize interference. This approach ensures efficient resource allocation and reduces interference in heterogeneous network environments where relay stations operate near cell boundaries. The method dynamically adjusts frequency usage based on the proximity of relay stations to adjacent cells, improving overall network performance and reliability.
14. A non-transitory computer readable medium that stores a program causing a computer to execute a processing operation as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, the computer caused to: store position information of the relay station and position information of the local cell and an adjacent cell; estimate the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decide a non-interference band of a central frequency that should not be interfered with; notify the base station of the adjacent cell of the decided non-interference band; and schedule radio resources in the local cell, when the non-interference band is notified from the adjacent cell, by avoiding the non-interference band of boundary frequencies of the adjacent cell.
A computer program stored on a non-transitory medium enables a computer to act as a base station that manages radio resources, relay stations, and mobile stations. The program causes the computer to: 1) Store positions of relay stations, the local cell, and adjacent cells. 2) Estimate the closest adjacent cell to a relay station and determine a "non-interference band" for a central frequency that should be protected. 3) Notify the adjacent cell of the non-interference band. 4) When notified of a non-interference band from the adjacent cell, the scheduler avoids using the adjacent cell's boundary frequencies within that band.
15. A communication apparatus operating as a relay station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and the relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the mobile station; a buffer that temporarily holds data to be relayed between the base station and the mobile station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit including a relay operation between the base station and the mobile station based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides non-interference bands of the central frequency of the second cell that should not be interfered, and the communication circuit transmits a radio signal by using a frequency band assigned to the relay station from among boundary frequencies such that a non-interference band of a central frequency of the adjacent cell is avoided.
A relay station has a communication circuit, buffer, scheduling information memory, and control circuit. The base station involved tracks positions of the relay station and nearby cells. The base station decides on "non-interference bands" for central frequency of the adjacent cell. The relay station's communication circuit transmits radio signals using frequency bands assigned from the boundary frequencies but it avoids transmitting on frequency band which is within the non-interference bands of an adjacent cell's central frequency.
16. A communication apparatus operating as a mobile station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, the mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the relay station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of the local cell and an adjacent cell, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides non-interference bands of the central frequency of the second cell that should not be interfered, and the communication circuit receives a radio signal using a frequency band assigned to the relay station from among boundary frequencies such that a non-interference band of a central frequency of the adjacent cell is avoided.
A mobile station has a communication circuit, scheduling information memory, and control circuit. The base station involved tracks positions of the relay station and nearby cells. The base station decides on "non-interference bands" for central frequency of the adjacent cell. The mobile station receives radio signals using a frequency band assigned to the relay station from the boundary frequencies, where those frequency bands are assigned in a way that avoids the "non-interference band" of the adjacent cell's central frequency.
17. A communication system, comprising: a plurality of local cells, each of which composed of a center region inside the cell using a central frequency and a boundary region at cell ends using boundary frequencies by a multi-cell frequency repetition and permitted to install a relay station to relay between a base station and a mobile station, wherein the base station includes a position information holding memory that stores position information of each relay station belonging to the local cell and position information of adjacent cells, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory, and decides a frequency to be assigned to the relay station from among boundary frequencies of the local cell while avoiding bands that become interference components to the central frequency of the adjacent cell near an installation location of the relay station, and at least in one local cell, the frequency from among the boundary frequencies of the local cell is assigned to the relay station.
A communication system consists of multiple local cells, each with a central frequency region and boundary frequency region. The base station tracks relay station positions within each cell and adjacent cells' positions. Based on relay station positions, the base station assigns frequencies to each relay station from the local cell's boundary frequencies. The assigned frequencies avoid bands that would interfere with the central frequency of nearby adjacent cells. Therefore, the frequency assigned to the relay station in at least one of the local cells comes from that cell's boundary frequencies.
18. The communication system according to claim 17 , wherein the communication system determines, in a group of plurality of cells which assigns common boundary frequencies, among those which are central frequencies of common adjacent cells and the common boundary frequencies, a common boundary frequency to be assigned to a relay station that is arranged close to the common adjacent cells.
The communication system described in claim 17 assigns frequencies to the relay station from among boundary frequencies while avoiding bands that interfere with the central frequency of nearby adjacent cells. In a group of cells using common boundary frequencies, the system designates a common boundary frequency (from the overlapping central frequencies of adjacent cells and their shared boundary frequencies) for relay stations positioned near the common adjacent cells.
19. A communication apparatus operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a position information holding memory that stores position information of each relay station belonging to the local cell and position information of adjacent cells; a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region highly likely to interfere with a central frequency of the adjacent cell; a notification circuit that notifies the adjacent cell of information about the given interference band decided by the relay station frequency assignment decision circuit; and a scheduler that assigns the frequency from among the boundary frequencies of the local cell to the relay station in the boundary region of the local cell while avoiding bands that become interference components to the central frequency of an adjacent cell near an installation location of the relay station and also assigns the central frequency of the local cell while avoiding the given interference band notified from the adjacent cell.
A base station manages radio resources, relay stations, and mobile stations. The base station stores positions of the relay stations within the local cell and the positions of adjacent cells. It determines an "interference band" for relay stations from the local cell's boundary frequencies, avoiding areas likely to interfere with the adjacent cell's central frequency. A notification circuit sends interference band information to the adjacent cell. The base station scheduler assigns frequencies from the local cell's boundary to the relay station avoiding interfering bands and also avoids the interference band reported from the adjacent cell when scheduling the local cell's central frequency.
20. A communication method for operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising the steps of: acquiring position information of each relay station belonging to the local cell and position information of adjacent cells; estimating the adjacent cell close to the relay station based on the position information and deciding a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region highly likely to interfere with a central frequency of the adjacent cell; notifying the adjacent cell of information about the given interference band decided in the relay station frequency assignment decision step; and assigning the frequency from among the boundary frequencies of the local cell to the relay station in the boundary region of the local cell while avoiding bands that become interference components to the central frequency of an adjacent cell near an installation location of the relay station and also assigning the central frequency of the local cell while avoiding the given interference band notified from the adjacent cell.
A method for a base station to manage radio resources, relay stations, and mobile stations: 1) Acquire positions of relay stations within the local cell and positions of adjacent cells. 2) Determine a relay station's "interference band" from the local cell's boundary frequencies, avoiding regions likely to interfere with the adjacent cell's central frequency. 3) Notify the adjacent cell of this interference band. 4) Assign frequencies from the local cell's boundary to the relay station, avoiding those that interfere with the adjacent cell's central frequency, and avoid assigning the local cell's central frequency from the "given interference band" notified from the adjacent cell.
21. A non-transitory computer readable medium that stores a program causing a computer to execute a processing operation as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, the computer caused to: store position information of each relay station belonging to the local cell and position information of adjacent cells; estimate the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decide a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region highly likely to interfere with a central frequency of the adjacent cell; notify the adjacent cell of information about the decided given interference band; and assign the frequency from among the boundary frequencies of the local cell to the relay station in the boundary region of the local cell while avoiding bands that become interference components to the central frequency of an adjacent cell near an installation location of the relay station and also assign the central frequency of the local cell while avoiding the given interference band notified from the adjacent cell.
A computer program stored on a non-transitory medium enables a computer to act as a base station for managing radio resources, relay stations, and mobile stations. The program: 1) Stores relay station and adjacent cell positions. 2) Determines a relay station's "interference band" from the local cell's boundary frequencies, avoiding regions likely to interfere with the adjacent cell's central frequency. 3) Notifies the adjacent cell of this interference band. 4) Assigns frequencies from the local cell's boundary to the relay station, avoiding those that interfere with the adjacent cell's central frequency and avoids assigning the local cell's central frequency within the interference band notified from the adjacent cell.
22. A communication apparatus operating as a relay station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and the relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the mobile station; a buffer that temporarily holds data to be relayed between the base station and the mobile station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit including a relay operation between the base station and the mobile station based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of adjacent cells, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region likely to interfere with a central frequency of the adjacent cell, and the communication circuit transmits a radio signal by using a frequency band assigned to the relay station from among the boundary frequencies such that bands that become interference components to a central frequency of the adjacent cell near an installation location of the relay station is avoided.
A relay station comprises a communication circuit, buffer, scheduling information memory, and control circuit. The base station involved stores the positions of the relay station and nearby cells. The base station calculates an "interference band" used by the relay station within the local cell's boundary frequencies. The frequencies are chosen to avoid interfering with a central frequency of the adjacent cell. The communication circuit transmits radio signals using frequencies assigned to the relay station from the boundary frequencies, avoiding frequency bands that would interfere with the adjacent cell's central frequency.
23. A communication apparatus operating as a mobile station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, the mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the relay station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of adjacent cells, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region likely to interfere with a central frequency of the adjacent cell, and the communication circuit receives a radio signal using a frequency band assigned to the relay station from among boundary frequencies such that bands that become interference components to a central frequency of the adjacent cell near an installation location of the relay station is avoided.
A mobile station includes a communication circuit, scheduling information memory, and control circuit. The base station stores the positions of the relay station and nearby cells. The base station calculates a "given interference band" used by the relay station from the local cell's boundary frequencies. The frequencies are chosen to avoid interfering with a central frequency of the adjacent cell. The communication circuit receives radio signals using a frequency band assigned to the relay station from the boundary frequencies, avoiding bands that interfere with a central frequency of the adjacent cell.
24. A communication apparatus operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a position information holding memory that stores position information of each relay station belonging to the local cell and position information of adjacent cells; a frequency information holding memory that stores boundary frequencies used by the local cell and boundary frequencies of each cell adjacent to the local cell; a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and fetches the boundary frequencies of the local cell and the adjacent cell stored in the frequency information holding memory to assign, to the relay station, the boundary frequencies to be common in a group of cells that assigns a common boundary frequency in a group of plurality of cells which assigns common boundary frequency, among those which are central frequency of common adjacent cells and the common boundary frequency, a common boundary frequency to be assigned to a relay station that is arranged close to the common adjacent cells; and a scheduler that schedules a central frequency of the local cell while conforming to a region assigned to the relay station by the relay station frequency assignment decision circuit and avoiding a given interference band commonly assigned to the relay station arranged close to the local cell in a group of the adjacent cells that assign the common boundary frequency.
A base station manages radio resources, relay stations, and mobile stations. The base station stores positions of relay stations within the local cell and positions of adjacent cells. It also stores boundary frequencies of the local cell and adjacent cells. It assigns common boundary frequencies to relay stations located near the same adjacent cells, choosing from among frequencies overlapping the central frequencies of adjacent cells and their common boundary frequencies. The scheduler assigns the local cell's central frequency, conforming to the relay station's assigned region, but avoids a common interference band assigned to the relay stations near local cell among the adjacent cells.
25. A communication method for operating as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising the steps of: storing position information of each relay station belonging to the local cell and position information of adjacent cells; storing boundary frequencies used by the local cell and boundary frequencies of each cell adjacent to the local cell; estimating the adjacent cell close to the relay station based on the position information and also identifying the boundary frequencies of the adjacent cell to assign, to the relay station, the boundary frequencies to be common in a group of cells that assigns a common boundary frequency in a group of plurality of cells which assigns common boundary frequency, among those which are central frequency of common adjacent cells and the common boundary frequency, a common boundary frequency to be assigned to a relay station that is arranged close to the common adjacent cells; and scheduling a central frequency of the local cell while conforming to a region assigned to the relay station in the relay station frequency assignment decision step and avoiding a given interference band commonly assigned to the relay station arranged close to the local cell in a group of the adjacent cells that assign the common boundary frequency.
A method for a base station to manage radio resources with relay stations and mobile stations: 1) Store positions of relay stations and adjacent cells. 2) Store boundary frequencies of the local cell and adjacent cells. 3) Determine adjacent cells and their boundary frequencies to assign common boundary frequencies to the relay stations positioned near the common adjacent cells. The common boundary frequency is based on overlapping regions of central frequencies of adjacent cells and the common boundary frequencies. 4) Schedule the local cell's central frequency conforming to assigned regions of the relay stations, and avoid a commonly assigned interference band from relay stations positioned near local cell across the adjacent cells.
26. A non-transitory computer readable medium that stores a program causing a computer to execute a processing operation as a base station in a communication system constituted by the base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, the computer caused to: store position information of each relay station belonging to the local cell and position information of adjacent cells; store boundary frequencies used by the local cell and boundary frequencies of each cell adjacent to the local cell; estimate the adjacent cell close to the relay station based on the position information stored in the position information holding memory and fetch the stored boundary frequencies of the local cell and the adjacent cell to assign, to the relay station, the boundary frequencies to be common in a group of cells that assigns a common boundary frequency in a group of plurality of cells which assigns common boundary frequency, among those which are central frequency of common adjacent cells and the common boundary frequency, a common boundary frequency to be assigned to a relay station that is arranged close to the common adjacent cells; and schedule a central frequency of the local cell while conforming to a region assigned to the relay station and avoid a given interference band commonly assigned to the relay station arranged close to the local cell in a group of the adjacent cells that assign the common boundary frequency.
A computer program stored on a non-transitory medium enables a computer to act as a base station. The program: 1) Stores positions of relay stations and adjacent cells. 2) Stores boundary frequencies of the local cell and adjacent cells. 3) Determines the adjacent cell to the relay station and fetches the boundary frequencies to assign common boundary frequencies to the relay stations positioned near the common adjacent cells. The common boundary frequency is based on overlapping regions of central frequencies of adjacent cells and the common boundary frequencies. 4) Schedules the local cell's central frequency, conforming to assigned regions of relay stations, and avoids a commonly assigned interference band by relay stations near local cell across the adjacent cells.
27. A communication apparatus operating as a relay station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, a mobile station, and the relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the mobile station; a buffer that temporarily holds data to be relayed between the base station and the mobile station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit including a relay operation between the base station and the mobile station based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of adjacent cells, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region likely to interfere with a central frequency of the adjacent cell, and the communication circuit transmits a radio signal by using a frequency to be common in a group of cells that assign a common boundary frequency to the boundary region among those which are central frequencies of the adjacent cells close to the local station and the boundary frequencies of the local cell.
A relay station has a communication circuit, buffer, scheduling information memory, and control circuit. The base station involved stores positions of relay station and adjacent cells. The base station decides on an "interference band" for the relay station within the local cell's boundary frequencies, avoiding regions likely to interfere with a central frequency of the adjacent cell. The communication circuit transmits radio signals using a common frequency from the boundary region to cells, where the frequencies comes from the central frequencies of the adjacent cells and the boundary frequencies of the local cell.
28. A communication apparatus operating as a mobile station in a communication system constituted by a base station managing radio resources in a local cell composed of an internal center region and a boundary region at edges, the mobile station, and a relay station relaying between the base station and the mobile station belonging to the relay station, comprising: a communication circuit to perform transmission/reception with the base station and the relay station; a scheduling information holding memory that stores scheduling information notified from the base station; and a control circuit that controls communication operations by the communication circuit based on the scheduling information, wherein the base station includes a position information holding memory that stores position information of the relay station and position information of adjacent cells, and a relay station frequency assignment decision circuit that estimates the adjacent cell close to the relay station based on the position information stored in the position information holding memory and decides a given interference band used by the relay station from among boundary frequencies of the local cell while avoiding a region likely to interfere with a central frequency of the adjacent cell, and the communication circuit receives a radio signal using a boundary frequency to be common in a group of cells that assign a common boundary frequency to the boundary region among those which are central frequencies of the adjacent cell near an installation location of the relay station and boundary frequencies of the local cell.
A mobile station has a communication circuit, scheduling information memory, and control circuit. The base station stores positions of the relay station and adjacent cells. The base station decides on a "given interference band" used by the relay station within the local cell's boundary frequencies, avoiding regions likely to interfere with a central frequency of the adjacent cell. The communication circuit receives radio signals using a common boundary frequency assigned to a group of cells, where the common frequency is a frequency from the central frequency of the adjacent cell and the boundary frequencies of the local cell.
29. A communication apparatus operating as a first base station in a communication system constituted by the first base station managing radio resources in a local cell, a mobile station and a relay station relaying between the first base station and the mobile station belonging to the relay station, the communication apparatus comprising: a notification circuit that notifies a second base station of an adjacent cell of interference information including at least a level of interference from the adjacent cell or a level of power managing for the radio resources; and a scheduler that schedules the radio resources in the local cell in view of the interference information notified from the second base station in the adjacent cell.
A first base station manages radio resources, mobile stations, and relay stations. It includes a notification circuit that sends interference information (interference level or power management level) to a second base station in an adjacent cell. It also includes a scheduler that assigns radio resources in the local cell, considering the interference information received from the second base station.
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October 14, 2014
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